Multilayer injection compression molding method using recycled material, and molded product molded through the same

a technology of injection compression molding and recycled material, which is applied in the direction of synthetic resin layered products, manufacturing tools, transportation and packaging, etc., can solve the problems of insufficient appearance and mechanical strength of parts of molded products of 100% recycled thermoplastic resin, low use rate of recycled thermoplastic resin through those recycling methods, and high cost of molded products. , to achieve the effect of improving the use rate of recycled thermoplastic resin material, improving the appearance and appearance, and improving the use rate of recycled thermoplastic resin

Inactive Publication Date: 2006-05-11
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0024] Further, an injection compression molded part has a thickness of 0.1 to 0.6 mm. Such a thickness provides best effects on color difference, sink mark, and the like and allows supply of a molded product with excellent appearance.
[0025] The present invention provides a multilayer molding method using an unused thermoplastic resin material and a recycled thermoplastic resin material, including molding at least one layer through an injection compression molding method. The multilayer molding method allows improvement in use rate of the recycled thermoplastic resin material with favorable appearance and sufficient mechanical strength maintained.
[0026] Further, a resin molded product having a multilayer structure is obtained through a multilayer molding method using an unused thermoplastic resin material and a pulverized and not-repelletized resin material prepared by pulverizing a molded product of a thermoplastic resin, the multilayer molding method being characterized by including molding at least one layer through an injection compression molding method. The resin molded product having a multilayer structure is capable of avoiding deterioration in physical properties due to heat history, has a high use rate of the recycled thermoplastic resin material, and can increase strength of the molded product at low cost without a repelletizing step.
[0027] A molded product molded by using materials such as a recycled resin and an unused resin with identical compositions facilitates processing for subsequent recycle use.

Problems solved by technology

However, a use rate of a recycled thermoplastic resin recycled through those recycling methods is actually low at about 30%, and a large amount of the recycled thermoplastic resin cannot be used for one molded product.
Meanwhile, a molded product of 100% recycled thermoplastic resin provides insufficient appearance and mechanical strength for parts such as external parts, housing parts, and mechanism elements of image forming apparatuses and information and communication devices (such as a copying machine, a printer, and a facsimile).
Such a housing part must have ensured appearance and mechanical strength, but use of a 100% recycled material hardly provides ensured functions of the functional parts due to deterioration in physical properties of the recycled material.

Method used

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  • Multilayer injection compression molding method using recycled material, and molded product molded through the same
  • Multilayer injection compression molding method using recycled material, and molded product molded through the same
  • Multilayer injection compression molding method using recycled material, and molded product molded through the same

Examples

Experimental program
Comparison scheme
Effect test

embodiment 1

[0035] A recycled thermoplastic resin 20 is injected from an injection cylinder 33 into a mold including a movable mold 30, a stationary mold 31, and inserts thereof while the mold is closed and a mold closing force is maintained. A molten resin is cooled and solidified while a dwell pressure is applied thereto, to thereby form a first layer (FIG. 1A). Note that the first layer need not be completely solidified.

[0036] Next, the movable mold 30 is moved back for several mm and stopped, and an unused thermoplastic resin 10 is injected from an injection cylinder 32 into a newly formed space between the stationary mold and the first layer (FIG. 2B). At this time, an amount of the resin need not be equal to an amount required for completely filling the space, and a predetermined amount thereof is injected. The movable mold 30 and the stationary mold 31 each have a joint opening wider than a mold opening distance from a completely closed mold, a structure corresponding to the joint, and ...

embodiment 2

[0042] An unused thermoplastic resin 10 is injected from the injection cylinder 32 into a space between the movable mold 30 and the stationary mold 31 by using the same mold as that of Embodiment 1 with the mold opened by several mm. At this time, an amount of the resin need not be equal to an amount required for completely filling the space, and a predetermined amount thereof was injected. The movable mold 30 and the stationary mold 31 each have a joint opening wider than a mold opening distance from a completely closed mold, a structure corresponding to the joint, and a function of sealing the injected resin.

[0043] Then, the movable mold 30 is moved in a direction of the stationary mold 31 for a predetermined distance before solidification of the injected molten resin during injection or after injection, to thereby compress the molten resin injected from the injection cylinder 32.

[0044] Next, the molten resin is cooled and solidified to form a first layer.

[0045] Next, the movab...

embodiment 3

[0053] A recycled thermoplastic resin 20 is injected from the injection cylinder 33 into the same mold as that of Embodiment 1 while the mold is closed and a mold closing force is maintained. A molten resin is cooled and solidified while a dwell pressure is applied thereto, to thereby form a first layer. Note that the first layer need not be completely solidified.

[0054] Next, the movable mold 30 is moved back for several mm and stopped, and an unused thermoplastic resin 10 is injected from the injection cylinder 32 into a newly formed space between the stationary mold 31 and the first layer. At this time, an amount of the resin need not be equal to an amount required for completely filling the space, and a predetermined amount thereof is injected. The movable mold 30 and the stationary mold 31 each have a joint opening wider than a mold opening distance from a completely closed mold, a structure corresponding to the joint, and a function of sealing the injected resin.

[0055] Then, ...

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Abstract

There is provided a multilayer molding method using an unused thermoplastic resin material and a recycled thermoplastic resin material, including molding at least one layer through an injection compression molding method. The multilayer molding method allows improvement in use rate of the recycled thermoplastic resin material with favorable appearance and sufficient mechanical strength maintained in reuse of the recycled thermoplastic resin into a product.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a molding method for reusing a recycled thermoplastic resin into a product, and to a molded product molded through the same. [0003] In particular, the present invention relates to a multilayer molding method using an unused thermoplastic resin material and a recycled thermoplastic resin material, including molding at least one layer formed of one of the unused thermoplastic resin material and the recycled thermoplastic resin material through an injection compression molding method, and to a molded product molded through the same. [0004] Further, the present invention relates to a technique of subjecting a molded product of a thermoplastic resin to pulverization treatment, and using the pulverized resin material as it is as a resin raw material for injection compression molding. [0005] Further, the present invention relates to a technique of recycling a plastic resin material used for...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B29C45/16B32B27/36B32B27/32B32B27/30
CPCB29C45/16B29C45/561B29K2105/26B32B27/06B32B27/08B32B27/302B32B27/32B32B27/365B32B2250/02B32B2250/24B32B2272/00B32B2274/00B32B2307/50Y10T428/31504Y10T428/31938Y10T428/31931Y10T428/31935Y10T428/31507
Inventor HAGIWARA, ISAOMATSUHISA, HIROHIDEMIYAUCHI, SHINICHIKUBOTA, SUMIRESAIKI, DAISHI
Owner CANON KK
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